FVXX20 KWBC 011420
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 1420 UTC 01 APR 1999 BY THE WASHINGTON VAAC
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SOUFRIERE HILLS 99-079    WEST INDIES 16.72N 62.18W  
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BACKGROUND:    SOUFRIERE HILLS  MONTSERRAT (1600-05)
               SUMMIT HEIGHT  3000 FT (915 M)
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SOURCES OF INFORMATION: MONTSERRAT VOLCANO OBSERVATORY.  1200 UTC
GUADELOUPE RADIOSONDE. GOES-8 VISIBLE SATELLITE IMAGERY. 
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ERUPTION DETAILS: ERUPTION AT ABOUT 0445 UTC
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DETAILS OF ASH CLOUD: VISIBLE IMAGERY SUGGESTED A POSSIBLE ASH CLOUD
OVER THE EASTERN CARIBBEAN.  AT 1332 UTC THE CLOUD WAS LOCATED
WITHIN 25 KM (13 NMI) EITHER SIDE OF A LINE EXTENDING FROM
16.4N/62.9W TO 16.5/63.9W TO 16.0N/64.7W TO 16.3N/65.1W.  THE HEIGHT
OF THIS ASH CLOUD WAS ESTIMATED AT FL050.  WHILE NO ASH COULD BE
DISCERNED FROM VISIBLE OR MULTISPECTRAL IMAGERY EAST OF CARIBBEAN IT
IS POSSIBLE THAT DIFFUSE ASH MAY EXIST OVER THE SOUTH CENTRAL
ATLANTIC ESPECIALLY IF THE MAXIMUM HEIGHT OF THE ERUPTING COLUMN
EXCEEDED FL100 AS WAS ORIGINALLY SUGGESTED BY THE MONTSERRAT VOLCANO
OBSERVATORY.  CAUTION IS ADVISED IN THESE AREAS.
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TRAJECTORY: TOWARD THE WEST AT 15 TO 20 KTS AT FL050.  ANY ASH AT
FL100 WOULD MOVE SOUTHEAST AT 10 KTS. ASH BETWEEN FL200 AND FL310
WOULD MOVE EAST BETWEEN 25 AND 50 KTS.
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THIS AND OTHER VOLCANIC ASH ADVISORY STATEMENTS OFTEN ACCOMPANIED BY
A MAP DEPICTING ASH LOCATION ARE AVAILABLE AT INTERNET URL ADDRESS
www.ssd.noaa.gov/VAAC/messages.html
(all lower case except /VAAC/)
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OUTLOOK: SEE SIGMETS.
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THE NEXT MESSAGE WILL BE ISSUED BY 01/1330 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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"Attached Graphic Map Depicting Ash" 

"Graphic Map Depicting Ash"